Method and device for controlling a semiconductor laser

Details Method and device for controlling a semiconductor laser Method and device for controlling a semiconductor laser

1997-09-17

1998-07-07

Bovernick, Rodney B.

Coherent light generators

Particular component circuitry

Optical pumping

372 29, 372 31, H01S 310

Patent

active

057780170

ABSTRACT:
The present invention relates to a semiconductor laser control method used preferably for a reading control system such as a bar code reading device and to a semiconductor laser control device employing the above method. The object of the invention is to provide a semiconductor laser control device which can be controlled based on the output of a semiconductor laser, provides a stable laser output in a noise environment, enables easy output adjustment, and is immune to external thermal or electrical noises. In the semiconductor laser control method where the light amount of a light amount to current controllable semiconductor laser is subjected to a feedback control with a predetermined time constant while it is monitored, when the light amount is less than a predetermined value, the semiconductor laser is subjected to an feedback control with a first time constant. When the light amount is more than a predetermined value, the semiconductor laser is subjected to a feedback control with a second time constant.

REFERENCES:
patent: 4837787 (1989-06-01), Takesue et al.
patent: 4876422 (1989-10-01), Fukushima
patent: 4884280 (1989-11-01), Kinoshita
patent: 5253267 (1993-10-01), Johnson
patent: 5309458 (1994-05-01), Carl
patent: 5309463 (1994-05-01), Kasai
patent: 5479424 (1995-12-01), Sakuyama

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